Here is a bunch of code tightening to make sure cancellation works even
if recently spawned actors haven't fully started up and the parent is
cancelled.
The fixes include:
- passing the arbiter socket address to each actor
- ensure all spawned actors respect the spawner's log level
- handle process versus final `portal.result()` teardown in multiple
tasks such that if a proc dies before shipping a result we don't wait
- more detailed debug logging in teardown code paths
- don't store peer connected events in the same `dict` as the peer channels
- if necessary fake main task results on peer channel disconnect
- warn when a `trio.Cancelled` is what causes a nursery to bail
otherwise error
- store the subactor portal in the nursery for teardown purposes
- add dedicated `Portal.cancel_actor()` which acts as a "hard cancel"
and never blocks (indefinitely)
- add `Arbiter.unregister_actor()` it's more explicit what's being
requested
- Allow passing in a program-wide `loglevel`
- Add detailed debug logging particularly to do with channel msg processing
and connection handling
- Don't daemonize subprocesses for now as it prevents use of
sub-sub-actors (need to solve #6 first)
- Add a `Portal.close()` which just tells the remote actor to tear down
the channel (for now)
- Add a message to signal the remote `StopAsyncIteration` from an async
gen such that the client side terminates properly as well
- Make `Actor.cancel()` cancel the channel server first
- Actors *must* complete the arbiter registeration steps before moving
on with their main taks and rpc handling
- When delivering rpc responses (using the local per caller queue) use
the blocking interface (`trio.Queue.put()`) to get backpressure
- Properly detect an `partial` wrapped async generators in `_invoke`
Fix quite a few little bugs:
- async gen func detection in `_invoke()`
- always cancel channel server on main task exit
- wait for remaining channel peers after unsub from arbiter
- return result from main task(s) all the way up to `tractor.run()`
Also add a `Portal.result()` for getting the final result(s) from the
actor's main task and fix up a bunch of docs.
Tyler Goodlet